Obj & Struc

8/3/2019 Obj & Struc

1/5

1.

The apparatus shown in the figure above was set up and used in a science activity.

Petri dish A is exposed to the air near a window, while Petri dish B is covered with a piece of

glass. Observation is recorded after 20 minutes.

a. What is the aim of this experiment?

________________________________________________________________

(1 marks ) b. State the variables

i. Manipulated : _______________________________________________

ii. Constant: __________________________________________________

iii Responding : _______________________________________________

( 3 marks )

c. Conclusion : The dust content in A is __________________than B.

( 1 mark )

d. Choose a suitable word from the list given below to fill in the spaces based on the

statements.

Mixture element compound molecule atom

i. Smallest particle in element. (..)

ii. Substance consisting of only one type of atom. (..)

iii. Combination of a group of atoms. (.)

iv. Substance consisting of two or more elements chemically combined together.

()

v. Substance consisting of two or more elements physically combined together

(..)

( 5 marks )

e. During filtration process, the _________________________is left over in he filter funnel

while the ____________________is collected in the beaker.

( 2 marks )


2/5

2. Diagram 2 shows the arrangement of the apparatus X and apparatus Y, that are used to

separate sand from salt water.

Diagram 2

a). State the nature of the particles of sand and salt water.

________________________________________________________________________

( 1 marks)

b). Name the processes labeled X and Y.

(i). X : __________________________________________________________________

(ii) Y : __________________________________________________________________

(2 marks)c). What are A and B

(i). A : __________________________________________________________________

(ii). B : __________________________________________________________________

( 2 marks)

d). State the hypothesis of this experiment.

________________________________________________________________________

________________________________________________________________________

( 1 mark )

e). What is the substance formed after A is heated until it is dry?

________________________________________________________________________

( 1 mark )

f). What is the conclusion of this experiment.

________________________________________________________________________

________________________________________________________________________

( 1 mark )


3/5

Objective Question.

1. Which of the following groups consists of metals only?

A. Carbon, magnesium, tin.

B. Alumunium, iron, mercury.

C. Silicon, copper, zinc.D. Zinc, sulphur, silver.

2. Which of the following is paired correctly ?

Examples of substances Substances

A Coin Mixture

B Carbon Metal

C Mercury Non Metal

D Copper Sulphate Molecule

3.

3

.

Which of the following statements is incorrect to describe the final result of theexperiment?

A A black coloured substance is formed

B Iron filling and sulphur powder are chemically combined

C No new substance is formed

D The original properties are completely changed

4.

Choose a mixture that can be separated by using the above method.

A Copper sulphide solution

B Sugar and water

C Salt and water D Flour and water


4/5

5.

A copper plate can light up the bulb when it is connected to the circuit,

suggest another substances that can do the same function

I aluminium

II silver

III iron

IV graphite

A I, II, III, IVB I, II, III

C II, III, IV

D 1, III

6. What is called if a substance can pilled into a wire ?

A. Brittle

B. Malleable

C. Ductile

D. Strong

7. Look at the information below.

Which of

the following is true about the copper and chlorine atoms in the compound?

A. Both can only be separated physically.

B. Both can be a mixture at any ratio.C. Both have different characteristics from the original elements.

D. Both have chemical characteristics that are similar.

8. Which of the following separation methods can be used to separe a mixture of water

and mud?

I. Crystallisation

II. Evaporation

III. Filtration

I dan II only

I and III onlyII and III only

Copper chloride is a compound, not a

mixture


5/5

I, II and III only

9. Diagram below shows a compound.

Which of the following probably represent atoms X and Y?

X Y

A Carbon Oxygen

B Oxygen Carbon

C Nitrogen Carbon

D Hydrogen Oxygen

10. Which of the following is a compound?

A. Sea water

B. Sulphur dioxide

C. Petroleum

D. Copper

Documents

Obj & Struc